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The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:
struct foo {
int stuff;
struct boo array[];
};
By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.
Also, notice that, dynamic memory allocations won't be affected by
this change:
"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]
This issue was found with the help of Coccinelle.
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit
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|---|---|---|
| .. | ||
| 9pfs.h | ||
| blkif.h | ||
| console.h | ||
| displif.h | ||
| fbif.h | ||
| kbdif.h | ||
| netif.h | ||
| pciif.h | ||
| protocols.h | ||
| pvcalls.h | ||
| ring.h | ||
| sndif.h | ||
| tpmif.h | ||
| vscsiif.h | ||
| xenbus.h | ||
| xs_wire.h | ||